Juan Li1,2,3, Lingyun Xiao4, Zhi Lu4,5. 1. Center for Nature and Society, College of Life Sciences, Peking University, Beijing, 100871, China. lijuan924@gmail.com. 2. Department of Environmental Science, Policy and Management, University of California, Berkeley, CA, 94720-3114, USA. lijuan924@gmail.com. 3. Panthera, New York, NY, 10018, USA. lijuan924@gmail.com. 4. Center for Nature and Society, College of Life Sciences, Peking University, Beijing, 100871, China. 5. Shanshui Conservation Center, Beijing, 100871, China.